Bianca Chang
Gastroenterology · West Hollywood, CANPI 1396188363
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $3,233 of the $4,901 with a category attached, or 66.0%. 11 manufacturers reported payments, led by Enterra Medical, Inc. at 29.3% of the total. Reporting peaked in 2024 at $2,321 and has fallen 70.4% since, to $688 in 2025.
Across 49 payments — averaging $100.02 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Enterra Medical, Inc.$1K
- Cook Medical LLC$906
- Sanofi$582
- Salix Pharmaceuticals, A Division Of Bausch Health US, LLC$558
- Ardelyx, Inc.$515
- Medtronic$305
- plus $599 from 5 others
What the payments were for
- Consulting fees$2004%
- Grants$80016%
- Travel & lodging$66814%
- Food & beverage$3,23366%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Enterra Medical, Inc. | 9 | $1,436 |
| Cook Medical LLC | 6 | $906 |
| Sanofi | 6 | $582 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 7 | $558 |
| Ardelyx, Inc. | 13 | $515 |
| Medtronic | 3 | $305 |
| Vibrant Gastro, Inc. | 1 | $200 |
| Phathom Pharmaceuticals, Inc. | 1 | $125 |
| Boston Scientific | 1 | $124 |
| Regeneron Healthcare Solutions, Inc. | 1 | $119 |
| Regeneron | 1 | $31 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
How this compares
$4,901 in reported general payments places this provider in the 65th percentile of 1,885 gastroenterology providers in California.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| LinzessLinaclotide | 21 | $15,993 |
Paid to pharmacies, not to this prescriber.
Other gastroenterology in West Hollywood
- Ali RezaieWest Hollywood$519K
- Maria AbreuWest Hollywood$491K
- Rabindra WatsonWest Hollywood$173K
- Barham AbudayyehWest Hollywood$171K
- Bennett RothLos Angeles$2.8M
- Douglas NguyenMission Viejo$2M
- Sammy SaabLos Angeles$1.9M
- Kenneth ChangNewport Beach$1.3M
- Joo HwangStanford$1M
- Drew SchembreWalnut Creek$659K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.